month of Sundays vs years

month of Sundays and years both are nouns.

Word	Noun	Adjective	Verb	Adverb
month of Sundays	Yes	No	No	No
years	Yes	No	No	No

As nouns, years is a hypernym of month of Sundays; that is, years is a word with a broader meaning than month of Sundays:

Other hypernyms of month of Sundays include age, long time.

month of Sundays (noun)	years (noun)
a time perceived as long	a late time of life
	a prolonged period of time
	the time during which someone's life continues